refactor(data_structures): remove redundant TypeVar from segment tree and skip list

Author: iosayin

data_structures/binary_tree/non_recursive_segment_tree.py

@@ -39,9 +39,7 @@
 from __future__ import annotations
 
 from collections.abc import Callable
-from typing import TypeVar, cast
-
-T = TypeVar("T")
+from typing import cast
 
 
 class SegmentTree[T]:

data_structures/linked_list/skip_list.py

@@ -7,10 +7,6 @@
 
 from itertools import pairwise
 from random import random
-from typing import TypeVar
-
-KT = TypeVar("KT")
-VT = TypeVar("VT")
 
 
 class Node[KT, VT]: